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There's lots of studies out there all suggesting that multivitamins are simultaneously good and bad. My nutrition specialist made it clear to me that while multi-vitamins can replace things you're missing out on, it's better to have slightly not enough than too much of something and that it's better to try to eat your vitamins in the way of food if possible. These days, the only vitamins I take are D in the winter and B12 if I haven't eaten enough meat. I think the only time I make an exception is when I'm too sick to properly cook a nutritious meal and I feel I should replace those nutrients somehow.